<template>
  <div id="app">
    <router-view/>
  </div>
</template>

<script>
// import Vue from 'vue'

export default {
  name: 'App',
  mounted () {
    // document.addEventListener('visibilitychange', function () {
    //   window.alert(document.visibilityState)
    // })
  }
}
</script>
